package demo0428;

import com.USB;

class Keyboard extends USB {
    @Override
    public void open() {
        System.out.println("键盘USB接口开启");
    }
    @Override
    public void close() {
        System.out.println("键盘USB接口关闭");
    }
    public void 敲击() {
        System.out.println("键盘被敲击");
    }
}
